The rates vary from location to location some areas in DHA and 100% of Bahria, the construction rates are higher. Due to recent changes in Bahria's rules the construction cost has gone up by 25% as compare to any other location in Islamabad.
Normal grey structure would cost you Rs.1000 per sqft. (depending on your map and site location) In Bahria the minimum is Rs.1250 per sqft for ground portion and Rs.1100 per sqft for first floor.

Yes, construction rate is different, depends on the location. I have experienced it personally and I know the construction company named by Amer Adnan Associates, which helps you regarding construction.

What is the current construction cost per square foot in DHA Karachi PHASE 6 The plot size is 600 yards ,covered area is planned to be 6000 square feet including 200 square feet of basement (servant quarter ).I need cost breakdown as under :

-Labour cost to be charged by contractor per square foot (turn key basis ) including grey structure and finishing .Is Chowkidar provided by contractor and included in labour rate per square feet or is that charged separately .

Construction rates if different , Its Depend upon area.
In Islamabad, The cost for this basic structure is approximately Rs. 1,500 per square foot. Once the grey structure is completed, the finishing touches have a cost of their own. Flooring, tiles, woodwork, paint and other details cost approximately an additional Rs. 1,000 per square foot.
Thanks. !!